Brake Switches

This vehicle is equipped with two brake switches each containing multiple sets of contacts and performing several functions. Both switches are located under left hand side of I/P on brake pedal support.

The Torque Management Brake Switch  contains two sets of electrical contacts and one vacuum port. The two sets of electrical contacts are normally closed and are referred to as Torque Converter Clutch (TCC) Brake and Extended Travel Brake Switch contacts. The TCC brake switch contacts provide ignition voltage to torque converter clutch when closed. The extended travel brake switch contacts are used in torque management to determine whether brakes are applied. The one vacuum port is Cruise Control vacuum dump port and vents cruise servo to atmosphere when brakes are applied.

The Stop/BTSI/Cruise Brake Switch  contains three sets of electrical contacts. Two sets of contacts are normally closed and one set is normally open. The one normally open set of contacts is referred to as stop lamp switch contacts and supplies power to stop lamps when brakes are applied. One set of normally closed contacts is referred to as BTSI brake switch contacts and supplies power to BTSI solenoid when brakes are not applied. The other normally closed set of contacts is used to disengage cruise when brakes are applied.